Pet step stool



FIG. 1 is a perspective frontal view of a pet step stool embodying my new design.

FIG. 2 is a side elevational view of the pet step stool shown in FIG. 1.

FIG. 3 is frontal elevational view of the pet step stool shown in FIG. 1.

FIG. 4 is a top plan view of the pet step stool shown in FIG. 1; and,

FIG. 5 is a rear elevational view of the pet step stool shown in FIG. 1. 

The ornamental design for a pet step stool, as shown and described. 